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Hexadecimal
Characters 0-9 and A-F
Hop
The action of data packets being transmitted from one router to another
Host
Computer on a network
HTTP
Hypertext Transfer Protocol is used to transfer files from HTTP servers (web servers) to
HTTP clients (web browsers)
HTTPS
HTTP over SSL is used to encrypt and decrypt HTTP transmissions
Hub
A networking device that connects multiple devices together
I
ICMP
Internet Control Message Protocol
IEEE
Institute of Electrical and Electronics Engineers
IGMP
Internet Group Management Protocol is used to make sure that computers can report
their multicast group membership to adjacent routers
IIS
Internet Information Server is a WEB server and FTP server provided by Microsoft
IKE
Internet Key Exchange is used to ensure security for VPN connections
Infrastructure
In terms of a wireless network, this is when wireless clients use an Access Point to gain
access to the network
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Internet
A system of worldwide networks which use TCP/IP to allow for resources to be accessed
from computers around the world
Internet Explorer
A World Wide Web browser created and provided by Microsoft
Internet Protocol
The method of transferring data from one computer to another on the Internet
Internet Protocol Security
IPsec provides security at the packet processing layer of network communication
Internet Service Provider
An ISP provides access to the Internet to individuals or companies
Intranet
A private network
Intrusion Detection
A type of security that scans a network to detect attacks coming from inside and outside
of the network
IP
Internet Protocol
IP address
A 32-bit number, when talking about Internet Protocol Version 4, that identifies each
computer that transmits data on the Internet or on an Intranet
IPsec
Internet Protocol Security
IPX
Internetwork Packet Exchange is a networking protocol developed by Novel to enable
their Netware clients and servers to communicate
ISP
Internet Service Provider
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J
Java
A programming language used to create programs and applets for web pages
K
Kbps
Kilobits per second
Kbyte
Kilobyte
L
L2TP
Layer 2 Tunneling Protocol
LAN
Local Area Network
Latency
The amount of time that it takes a packet to get from the one point to another on a
network. Also referred to as delay
LED
Light Emitting Diode
Legacy
Older devices or technology
Local Area Network
A group of computers in a building that usually access files from a server
LPR/LPD
"Line Printer Requestor"/"Line Printer Daemon". A TCP/IP protocol for transmitting
streams of printer data.
M
MAC Address
A unique hardware ID assigned to every Ethernet adapter by the manufacturer.
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Mbps
Megabits per second
MDI
Medium Dependent Interface is an Ethernet port for a connection to a straight-through
cable
MDIX
Medium Dependent Interface Crossover, is an Ethernet port for a connection to a
crossover cable
MIB
Management Information Base is a set of objects that can be managed by using SNMP
Modem
A device that Modulates digital signals from a computer to an analog signal in order to
transmit the signal over phone lines. It also Demodulates the analog signals coming from
the phone lines to digital signals for your computer
MPPE
Microsoft Point-to-Point Encryption is used to secure data transmissions over PPTP
connections
MTU
Maximum Transmission Unit is the largest packet that can be transmitted on a packet-
based network like the Internet
Multicast
Sending data from one device to many devices on a network
N
NAT
Network Address Translation allows many private IP addresses to connect to the
Internet, or another network, through one IP address
NetBEUI
NetBIOS Extended User Interface is a Local Area Network communication protocol. This
is an updated version of NetBIOS
NetBIOS
Network Basic Input/Output System
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Netmask
Determines what portion of an IP address designates the Network and which part
designates the Host
Network Interface Card
A card installed in a computer or built onto the motherboard that allows the computer to
connect to a network
Network Layer
The third layer of the OSI model which handles the routing of traffic on a network
Network Time Protocol
Used to synchronize the time of all the computers in a network
NIC
Network Interface Card
NTP
Network Time Protocol
O
OFDM
Orthogonal Frequency-Division Multiplexing is the modulation technique for both 802.11a
and 802.11g
OSI
Open Systems Interconnection is the reference model for how data should travel
between two devices on a network
OSPF
Open Shortest Path First is a routing protocol that is used more than RIP in larger scale
networks because only changes to the routing table are sent to all the other routers in the
network as opposed to sending the entire routing table at a regular interval, which is how
RIP functions
P
Password
A sequence of characters that is used to authenticate requests to resources on a network
Personal Area Network
The interconnection of networking devices within a range of 10 meters
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